Clicking a Button and Opening a new Activity [duplicate] - android

This question already has an answer here:
Android adding new xml and class
(1 answer)
Closed 8 years ago.
This could be perceived as a silly question, but I am very new to Android.
I am making an app and I have added an info Activity, I have an info button on my main page and want to go to the info activity when I click it..
I'm actually not sure how to go about it.
this is the xml for the Button:
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="#FFFFFF"
android:text="#string/info_btn" />
Do I add the code in the main activity, the intro activity or the xml?
This is my main activity
package ie.gmit.project;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
public void openSite(View v){
Uri uri = Uri.parse("http://gmitsu.ie/clubssocs/directory.html");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
UPDATED:
This has the updated code, and runs error free... but the button still will not go to the new activity when I run it.
package ie.gmit.project;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
private Button button2;//this is a bad name
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button2= (Button) findViewById(R.id.button2);//find the button
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(v.getContext(), IntroActivity.class);
startActivity(i);
// finish();//if you want to close main activity after start info activity
}});
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
public void openSite(View v){
Uri uri = Uri.parse("http://gmitsu.ie/clubssocs/directory.html");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ie.gmit.project"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="ie.gmit.project.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="ie.gmit.project.IntroActivity"
android:label="#string/title_activity_intro" >
</activity>
</application>
</manifest>

try this
public class MainActivity extends Activity {
private Button button2;//this is a bad name
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
button2= (Button) findViewById(R.id.button2);//find the button
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(v.getContext(), InfoActivity.class);
startActivity(i);
finish();//if you want to close main activity after start info activity
});
}
declare in manifest intro activity in manifest
<activity
android:name=".IntroActivity"
android:label="Intro Activity"
android:theme="#android:style/Theme.Light.NoTitleBar.Fullscreen" >
</activity>
if this does not work you can add entries to the log to see if the data are assigning well, such as:
#Override
public void onClick(View v) {
Log.i("MyLog", "Im here!");
Intent i = new Intent(v.getContext(), InfoActivity.class);
startActivity(i);
finish();//if you want to close main activity after start info activity
});

Related

The startactivity(intent) method causes an error. Why?

I want after a click on the OK button the MenuActivity to be shown. I have already searched on the Internet to find an answer and tried everything. I haave the activity declared in the AndroidManifest and I also tried to use Intent(this, MenuActivity.class) and also the one with the action inside but it doesn't work.
MainActivity:
package com.jamesjohnson.chronos;
import android.app.AlertDialog;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.*;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.jamesjohnson.chronos.R;
public class MainActivity extends ActionBarActivity implements OnClickListener {
private static final String TAG = "MainActivity";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.setTitle("Willkommen");
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
switch(id) {
case R.id.action_mainmenu:
startActivity(new Intent("com.jamesjohnson.chronos.MenuActivity"));
return true;
case R.id.action_settings:
showMessageBox("Es gibt leider noch keine Einstellungen. Wir arbeiten daran!", true, true);
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onClick(View v) {
try {
Intent intent = new Intent(MainActivity.this, MenuActivity.class);
Context ctx = this;
intent.setClassName(ctx, "com.jamesjohnson.chronos.MenuActivity");
intent.setAction("com.jamesjohnson.chronos.MenuActivity");
if ((intent.getAction() == "com.jamesjohnson.chronos.MenuActivity") || (intent.getClass() != null)) {
MainActivity.this.startActivity(intent);
showMessageBox("Button has been pressed " + intent.toString(), true, true);
}
else {
showMessageBox("Error : Hauptmenü ist nicht erreichbar", true, true);
}
}
catch (ActivityNotFoundException an) {
showMessageBox("Error :" + an.getMessage(), true, true);
}
catch (Exception e) {
showMessageBox("Error :" + e.getMessage(), true, true);
}
}
protected void showMessageBox(String message, boolean showOKbutton, boolean canceable) {
AlertDialog.Builder dlgAlert = new AlertDialog.Builder(MainActivity.this);
dlgAlert.setMessage(message);
dlgAlert.setTitle("Chronos");
if (showOKbutton) {
dlgAlert.setPositiveButton("OK", null);
}
if (canceable) {
dlgAlert.setCancelable(true);
}
dlgAlert.create().show();
}
}
Here's my AndroidManifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jamesjohnson.chronos"
android:versionCode="1"
android:versionName="1.0.1
" >
<application
android:allowBackup="true"
android:debuggable="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MenuActivity"
android:label="#string/title_activity_menu"
android:parentActivityName=".MainActivity" >
<intent-filter>
<action android:name="com.jamesjohnson.chronos.MenuActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<!-- Parent activity meta-data to support 4.0 and lower -->
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.jamesjohnson.chronos.MainActivity" />
</activity>
</application>
</manifest>
And finally here's the MenuActivity:
package com.jamesjohnson.chronos;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MenuActivity extends ListActivity {
private static final String TAG = "MenuActivity";
static final String[] ENTRIES = new String[] {"Kunden", "Projekte", "Leistungen", "Zeiten"};
ListView listView = getListView();
#Override
protected void onCreate(Bundle savedInstanceState) {
showMessageBox("Activity is beeing created", true, true);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
this.setTitle("Hauptmenü");
this.setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, ENTRIES));
listView.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position) {
case 0:
showMessageBox("Kunden", true, true);
break;
case 1:
showMessageBox("Projekte", true, true);
break;
case 2:
showMessageBox("Leistungen", true, true);
break;
case 3:
showMessageBox("Zeiten", true, true);
break;
default:
showMessageBox("Error: Undefined index", true, true);
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
protected void showMessageBox(String message, boolean showOKbutton, boolean canceable) {
AlertDialog.Builder dlgAlert = new AlertDialog.Builder(MenuActivity.this);
dlgAlert.setMessage(message);
dlgAlert.setTitle("Chronos");
if (showOKbutton) {
dlgAlert.setPositiveButton("OK", null);
}
if (canceable) {
dlgAlert.setCancelable(true);
}
dlgAlert.create().show();
}
}
Unfortunately I can't show you my Logcat because it doesn't work on my computer. (I always have to export the APK to test the App).
P.S. I am working with Android Studio 1.0.1
...Please HELP ME !
To open a new activity you simply have to call it like this inside the onClick method.
Intent intent = new Intent(v.getContext(), MenuActivity.class);
startActivity(intent);
So your onClick method will look like this.
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), MenuActivity.class);
startActivity(intent);
}
Hope this helps.
Is because you say MainActivity.this, but you aren't in the MainActivity context.
You could make a reference of your current context in onCreate() and save it in a field:
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
context = this;
//rest of your code here
}
and use it as:
Intent intent = new Intent(context, MenuActivity.class);
//Something else
context.startActivity(intent);
Go to your manifest file, you will for your MainActivity manifest:
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
Just copy them and paste them for your MenuActivity.
I had the same same problem than you and it worked for me, but I don't know why.
Good luck!
first make sure your AndroidManifest.xml file contain declaration of all Activities in your app, like
<activity android:name=".MenuActivity"/>
then you create new intent and start it where you need to start the second Activity
Intent intent = new Intent(v.getContext(), MenuActivity.class);
startActivity(intent);

How can i switch activity using Button?

How can i switch activity using Button? this is my problem:
package net.example.finals;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment implements OnClickListener {
Button bq;
Button bw;
Button be;
Button br;
Button bt;
Button by;
Button bu;
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_second,
container, false);
bq=(Button)rootView.findViewById(R.id.btn1);
bq.setOnClickListener(this);
bw=(Button)rootView.findViewById(R.id.btn2);
bw.setOnClickListener(this);
be=(Button)rootView.findViewById(R.id.btn3);
be.setOnClickListener(this);
br=(Button)rootView.findViewById(R.id.btn4);
br.setOnClickListener(this);
bt=(Button)rootView.findViewById(R.id.btn5);
bt.setOnClickListener(this);
by=(Button)rootView.findViewById(R.id.btn6);
by.setOnClickListener(this);
bu=(Button)rootView.findViewById(R.id.btn7);
bu.setOnClickListener(this);
return rootView;
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//i dont know what to put here
case R.id.btn1:
if(bq.callOnClick()==true){
Intent myOwnIntent = new Intent(getActivity(), Second.class);
startActivity(myOwnIntent);
}
break;
}
}
}
Why did you use "if(bq.callOnClick()==true)" this?
Android use a lots of java code, first you need to learn java properly.
AND Google too
#Override
public void onClick(View v) {
int id = v.getId();
switch(id){
case R.id.btn1:
Intent myOwnIntent = new Intent(YourActivityName.this, Second.class);
startActivity(myOwnIntent);
break;
}
}
Try this one.
How to start new activity on button click
Start another activity by clicking a button
Android eclipse how to start a new activity on button click

error on creating new intent

what's wrong with MainActivity.this here:
Intent myIntent = new Intent(MainActivity.this, SecondActivity.class);
when I press Ctrl+Space it suggest MainActivity.this but then rais an error :
this is Java :
package com.example.explicitintent;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
Button btn = (Button)rootView.findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent myIntent = new Intent(MainActivity.this, SecondActivity.class);
startActivity(myIntent);
}
});
return rootView;
}
}
}
and this is error:
Try this..
If you use that intent in extends Activity your method is correct but your extends Fragment try below use getActivity()
Intent myIntent = new Intent(getActivity(), SecondActivity.class);
startActivity(myIntent);

Android First App Error(Starting another activity)

I have a problem with loading another activity.I followed Tutorial When I click the button "Send", the application stops. Can anyone determine my error?
here is my MainActivity.java
package com.example.myfirstapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/** Called when the user clicks the Send button */
public void sendMessage(View view) {
Intent intent = new Intent(MainActivity.this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,false);
return rootView;
}
}
}
here is my DisplayMeassageActivity.java:
public class DisplayMessageActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
setContentView(textView);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.display_message, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_display_message,
container, false);
return rootView;
}
}
}
here is my fragment_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context="com.example.myfirstapp.MainActivity$PlaceholderFragment" >
<EditText android:id="#+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="#string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:onClick="sendMessage" />
</LinearLayout>
and AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.myfirstapp.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.myfirstapp.DisplayMessageActivity"
android:label="#string/title_activity_display_message"
android:parentActivityName="com.example.myfirstapp.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.myfirstapp.MainActivity" />
</activity>
</application>
</manifest>
Issue is with your DisplayMessageActivity onCreate.
You are trying to add the Fragment before the contentView is set.
Aslo your setContentView(textView) is setting only a TextView.
So, you need to remove the code adding a fragment or create a layout and set a ContentView before finding a View.

I am facing difficulty to show Google Map after click on Button in android?

I am creating an app in android.
In this app i want to show google Map after click on button.
I have declared button and i declared listener.
But my problem is i want to call another activity class in the action listener and show google map.
But it is not working, I changed emulator from google to Android it work but google API is not called and shows me error.
for this i used this code But my Map is not show and my Application is Terminated .
//----------------Main Activity ---------------//
import java.security.PublicKey;
import com.google.android.maps.MapView;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
EditText TextFeild;
Button button1;
Context context=this;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addOnListenerAction();
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
public void addOnListenerAction()
{
TextFeild=(EditText) findViewById(R.id.editText1);
button1=(Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
Intent intent=new Intent(context,MapViwer.class);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
//_-------------------MapViwer Class------------//
import android.os.Bundle;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
public class MapViwer extends MapActivity
{
MapView map;
public void onCreate(Bundle setInstanceState)
{
super.onCreate(setInstanceState);
setContentView(R.layout.activity_main);
map=(MapView) findViewById(R.id.mapView);
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
So you're saying, you have a class named (MapViwer) that defines a layout and the class (MapViwer) contains information for the map to work. To deploy a class from your MainActivity.class, use the following method.
in MainActivity, under the public class add this
private Button button1;
then add this function -
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
Intent i = new Intent(getApplicationContext(), MapViwer.class);
startActivityForResult(i, 100);
}
});
Use it like this..It worked for me..
Button b=(Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(MainActivity.this,MapViewer.class);
startActivity(intent);
}
});
and in the Mapviewer class just call the mapviewer.xml
Now, the mapviewer.xml should look like this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_marginBottom="34dp" />
</LinearLayout>
Try it out..
Replace context with Mainactivity.this in the code
Intent intent=new Intent(context,MapViwer.class);
You just only defined intent but didn't call the Mapviewr activity
Correct code:
public void addOnListenerAction()
{
TextFeild=(EditText) findViewById(R.id.editText1);
button1=(Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
Intent intent=new Intent(Mainactivity.this,MapViwer.class);
startActivity(intent);
}
});
}

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